Why is gulp autoprefixer not being installed?

Question

Layout

$ npm install gulp-autoprefixer --save-dev
npm ERR! Windows_NT 6.1.7601
npm ERR! argv "c:\\Program Files\\nodejs\\node.exe" "c:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "install" "gulp- autoprefixer" "--save-dev"
npm ERR! node v0.12.7
npm ERR! npm v2.11.3
npm ERR! file c:\Dropbox\cite\makets\loft\package.json
npm ERR! code EJSONPARSE
npm ERR! Failed to parse json
npm ERR! Trailing comma in object at 15:3
npm ERR! }
npm ERR! ^
npm ERR! File: c:\Dropbox\cite\makets\loft\package.json
npm ERR! Failed to parse package.json data.
npm ERR! package.json must be actual JSON, not just JavaScript.
npm ERR!
npm ERR! This is not a bug in npm.
npm ERR! Tell the package author to fix their package.json file. JSON.parse
npm ERR! Please include the following file with any support request:
npm ERR! c:\Dropbox\cite\makets\loft\npm-debug.log

Answer 1

package.json must be actual JSON, not just JavaScript.

Trailing comma in object at 15:3
npm ERR! }